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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Revenue from services $ 1,668,929 $ 1,389,530 $ 1,316,013
Cost of services 1,226,626 1,017,145 968,967
Gross profit 442,303 372,385 347,046
Selling, general and administrative expenses 362,248 300,459 282,828
Depreciation and amortization 20,472 18,890 16,384
Income from operations 59,583 53,036 47,834
Interest expense (1,248) (1,131) (1,207)
Interest and other income 2,602 2,700 2,697
Interest and other income, net 1,354 1,569 1,490
Income (loss) before tax expense 60,937 54,605 49,324
Income tax expense 16,013 20,976 18,533
Net income 44,924 33,629 30,791
Net income per common share:      
Basic (in dollars per share) $ 1.12 $ 0.85 $ 0.73
Diluted (in dollars per share) $ 1.11 $ 0.84 $ 0.73
Weighted average shares outstanding:      
Basic (in shares) 40,166 39,548 41,961
Diluted (in shares) 40,502 39,862 42,322
Foreign currency translation adjustment, net of tax (689) 175 (263)
Unrealized loss on investments, net of tax (96) 0 0
Total other comprehensive income (loss), net of tax (785) [1] 175 (263)
Comprehensive income $ 44,139 $ 33,804 $ 30,528
[1] The tax impact of the components of other comprehensive income (loss) was immaterial.